Russian occupation of Ukraine is a bit more complicated. It's in the context of a red line they set out decades ago, which is that NATO wouldn't be able to extend all the way to the Russian border in the south.

Now certainly that's a bit unreasonable as countries should be allowed to associate with whoever they want, but it's not exactly a live wire threatening war left and right, it's a red line they set out a very long time ago, and there's not much reason to think they're interested with much beyond that red line.